Jamie Vardy and James Maddison scored as Leicester won a record seventh straight Premier League game with a 2-0 victory over Watford.
Vardy, who was also on target for the seventh league game in a row, scored from the spot 10 minutes after the break after Jonny Evans had been awarded a soft penalty for a hand in the face from Adam Masina.
Watford, under the guidance of caretaker head coach Hayden Mullins for the first time, had kept their hosts at bay well to that point but struggled once Leicester took the lead. They were punished late on as Maddison strode through before firing into the bottom corner in injury time (90+5).
The visitors had only one shot on target all game while Harvey Barnes and Ayoze Perez both twice missed presentable chances, but a Leicester side below their best still did enough to earn three points which lift them back up to second place, and eight points off leaders Liverpool.
Leicester: Schmeichel (6), Pereira (7), Evans (7), Soyuncu (6), Fuchs (6), Tielemans (6), Ndidi (6), Perez (5), Maddison (7), Barnes (7), Vardy (7).
Subs: Praet (7), Choudhury (6), Justin (7).
Watford: Foster (7), Femenia (5), Mariappa (5), Cathcart (6), Masina (7), Capoue (6), Doucoure (6), Hughes (6), Sarr (7), Deeney (6), Deulofeu (6).
Subs: Success (6), Quina (6), Gray (n/a).
Man of the match: Harvey Barnes
How Leicester made history
Leicester's seventh league win in succession matched their all-time top-flight run of victories, set under Matt Gillies in March 1963, and owed something to a questionable penalty decision from Craig Pawson which changed the game.
For most of the first half, Watford had held their own against the championship-chasing Foxes, but were thankful they were not behind early on to a pair of dreadful misses from Perez, who first fired over when well-placed and then volleyed well wide unmarked minutes later.
But once they managed to build a foothold in the game, Mullins' side began to impress and looked to catch out their hosts on the counter with the pace of Ismaila Sarr and Gerard Deulofeu, albeit to limited effect in front of goal.
Leicester were struggling to create chances of note too, and Barnes took matters into his own hands when he danced through the box before Ben Foster kept him out with a comfortable low save.
Vardy might have had a penalty before the break when Pawson made his first big call of the night, booking the striker for a dive under what looked a clear foul from Adrian Mariappa, but a VAR review decided the contact did not meet the 'clear and obvious' threshold required.
Shortly after half-time Pawson would play his part again as he gave the hosts the chance to score from 12 yards, pointing to the spot when Evans made the most of Masina's inadvertent touch on his face.
Both teams made a single change from their weekend games, with Christian Fuchs replacing Ben Chilwell in the Leicester defence.
Watford replaced the injured Jose Holebas with captain Troy Deeney in a change of shape from their 2-1 loss at Southampton.
With another VAR check complete and the decision standing, Vardy never looked likely to miss and outfoxed a motionless Foster to fire into the bottom corner and, as is so often the case, the opening goal seemed to finally spring the scorers into life.
Vardy almost added a second minutes after his first when he was played through by Youri Tielemans but after he lifted the ball over Foster, Masina raced back to acrobatically clear off the line.
Barnes again came close but took too much time on the ball before Foster sprawled at his feet to clear as the Foxes' profligacy set up a tense finish, but after Maddison took advantage of a poor touch from Mariappa to slot in a late second, they could breathe a sigh of relief as they regained second place from Manchester City.
What the managers said...
Leicester's Brendan Rodgers: "We've played better this season, however the mentality of the team and the ability to keep going, Hayden set Watford up very, very well, they were very compact, deep and tight, and that's always difficult.
"We had to keep our perseverance, and once we got the breakthrough with the penalty, they had to come out a little bit more and the spaces opened up for us. It was a fantastic win for us, and to keep another clean sheet was equally important."
Watford's Hayden Mullins: "We started off really well, really positive, and it grew into a bit of a tough result. It's a tough one to take because I thought they did really well.
"I didn't really see the penalty, the on-field ref gave it, the VAR checked it and gave it, so I don't think we can have too many complaints. The main thing tonight for us was the performance, and how proud we were of the side.
"The main focus for us for the last couple of days was Leicester, and I haven't had any conversations with the club. If they need me to, I'll take training and bits and pieces and go into Saturday."
Man of the match - Harvey Barnes
Barnes did everything except score against Watford, and was given a standing ovation when he was substituted with 20 minutes to go. He was a real bundle of energy, here, there and everywhere and looked mature in his decision-making for the most part, although he could have shown more composure in shooting earlier with a second-half effort.
He had more shots on target than anyone else on the pitch and on a night where Jamie Vardy often found himself out of the game, he stepped into the limelight very well.
- Watford have won just eight points in their last 18 Premier League games (W1 D5 L12) - opponents Leicester City have won more than this in their last three league games alone (three wins, nine points).
- Jamie Vardy has now scored 50 Premier League goals at home for Leicester City; 30 more than any other player (Muzzy Izzet: 20).
- Leicester City striker Jamie Vardy has scored 23 goals in 25 games under Brendan Rodgers in the Premier League; the same tally as he scored under the management of Claude Puel in 51 Premier League games.
Leicester travel to Aston Villa on Sunday at 2pm, live on Sky Sports Premier League from 1pm. Watford host Crystal Palace at Vicarage Road on Saturday at 3pm.
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